WO2018192101A1

WO2018192101A1 - Speed detection-based control method and control system for providing auxiliary force to open or close sliding door, and fume hood

Info

Publication number: WO2018192101A1
Application number: PCT/CN2017/092087
Authority: WO
Inventors: 阮红正; 唐光野; 谢长军; 卢丙利
Original assignee: 倚世节能科技（上海）有限公司
Priority date: 2017-04-20
Filing date: 2017-07-06
Publication date: 2018-10-25
Also published as: CN107083896B; CN107083896A

Abstract

A speed detection-based control method and control system (1) for providing an auxiliary force to open or close a sliding door (2), and fume hood. The sliding door (2) is connected to a drive motor (3). The control method comprises the following steps: detecting a real-time moving speed of the sliding door (2) in a door opening or closing direction (S10); determining whether the real-time moving speed is greater than or equal to a predetermined speed (S20); if so, then activating the drive motor (3) to drive the sliding door (2) to open or close (S40); if not, then detecting whether a displacement of the sliding door (2) reaches a predetermined displacement magnitude (S30); and if so, then activating the drive motor (3) to drive the sliding door (2) to open or close (S40), or else repeating the speed detection step. By detecting a real-time moving speed of the sliding door (2) to enable or disable an auxiliary force to assist opening or closing of the sliding door (2), the present invention enables smooth and automatic opening or closing of the sliding door (2) by means of an auxiliary force provided by the drive motor (3) after a user provides an initial push, thus providing superior user experience.

Description

Control method, control system and fume hood of speed-measuring power-assisted switch

Technical field

The invention relates to the field of control regulation systems, in particular to a control method and a control system for a speed-measuring power-assisted switch sliding door, and a fume hood to which the control system is applied.

Background technique

The fume hood is an integral part of the laboratory ventilation design. In order to prevent laboratory workers from inhaling or ingesting some toxic, pathogenic or toxic chemicals and organisms, there should be good ventilation in the laboratory. To prevent the absorption of some vapors, gases and particulates (smoke, soot, dust and aerosols), the pollutants must be removed by means of a fume hood, hood or partial ventilation. Conventional fume hoods generally use buttons and foot switches to control the motor's forward and reverse rotation, thus controlling the automatic lifting of the ventilating cabinet sliding door. When the motor is controlled by a button or foot switch, when the user gives the sliding door an upward (or downward) When the thrust is applied, the impact of the motor assisting start or stop is large, and the user experience is poor. Therefore, it is necessary to design a control method for the automatic lifting of the upper and lower sliding doors of the booster cabinet.

In the Chinese utility model patent document with the patent number CN204386334U, an automatic lifting device for the sliding door of the fume hood is disclosed, which comprises a fume hood frame for fixing the sliding door, a sliding door mounted on the frame, and a sliding door for moving up and down. The steel cable; the motor is arranged on the frame of the fume hood; the encoder is connected to the shaft end of the motor; the start and stop action of the motor is controlled by the servo controller; the encoder gives the servo controller execution signal through the steering of the motor shaft, thereby controlling the motor start The steel cable connected to the sliding door is arranged on the motor shaft, and the moving door is moved up and down by the steel cable to drive the motor shaft to rotate; the steel cable is also connected with the balance block for balancing the weight of the sliding door through the pulley block; the position detecting sensor is arranged at the top of the sliding door; . The utility model adopts a motor steering detecting device, and the starting speed and the moving distance are controlled by a program, and the position determination is performed. As soon as the light is lifted, the motor follows the start and smoothly reaches the designated position; the closing door is also pulled downward, and the motor starts to start smoothly. Arrive at the bottom position.

Specifically, after the power supply cabinet is energized, the position detection is first performed, and the sliding door first returns to the closed state (the automatic stop when the obstacle is hit); when the externally moves the sliding door upward (downward), the door is driven by the steel cable. The motor shaft rotates forward (reverse), and the encoder gives the servo controller execution signal through the steering of the shaft, thus controlling the motor to start. The whole motion is relatively stable (only a slight rotation can be used to obtain the signal), the speed and moving distance of the motor. The motor is controlled by PLC programming to control the servo controller. The utility model patent document controls the starting speed and movement of the sliding door by detecting the position of the sliding door The distance does not explain the detailed control process and cannot achieve good practical results.

In the Chinese utility model patent document with the patent number CN204747039U, an intelligent fume hood is disclosed, which comprises a cabinet body, an adjustment door and a ventilation pipe, and the adjustment door is installed in the cabinet body, and the ventilation pipe is installed at the top of the cabinet body, in the ventilation pipe A variable air volume valve is installed, and a displacement sensor is disposed on an inner side of the upper portion of the cabinet for monitoring a height change of the adjusting door, and transmitting a position signal of the adjusting door to a fume hood monitor, wherein the fume hood is The monitor controls the opening of the variable air volume valve. The intelligent fume hood of the utility model can automatically adjust the ventilation required by the wind of the fume hood according to the height of the adjusting door, and achieve the precise control effect of the constant wind speed of the fume hood, and the fume hood also has various work such as energy saving and delay. The mode is more environmentally friendly while ensuring the ventilation effect; in addition, the regulating door of the fume hood can be automatically raised and lowered, and the operation is convenient.

Wherein, a transmission device is further mounted on the inner side of the upper part of the cabinet body, and the transmission device drives the adjustment door to be lifted and lowered, and an adjustment door switch is arranged at the bottom of the cabinet body, and the adjustment door switch is divided into a rising foot switch and a descending foot pedal. The switch controls the working state of the transmission by adjusting the door switch, so that the automatic lifting of the adjusting door can be realized. The utility model detects the position signal of the door through the displacement sensor, and the automatic lifting of the door is driven by the transmission device. However, the transmission device is not combined with the position signal, thereby helping the door to automatically lift and lower, so that no better control effect is achieved.

It can be known from the above patent documents that the current ventilating cabinet switch sliding door mostly detects the height of the sliding door by detecting the position height of the sliding door, or controls the automatic lifting of the sliding door according to the change value of the position, or by detecting the additional torque value on the sliding door, according to the motor The power is used to control the automatic lifting of the sliding door. These two methods can not achieve accurate control effects, and are not conducive to energy saving of the fume hood.

Summary of the invention

In order to solve the above problems, an object of the present invention is to provide a control method for a speed-measuring power-assisted switch sliding door. The sliding door is connected to the driving motor, and includes the following steps: speed detecting, detecting a real-time moving speed of the sliding door in the direction of opening or closing the door; Speed judgment, determine whether the real-time moving speed is greater than or equal to the set speed, if yes, enter the motor starting step, if not, enter the displacement determining step; displacement judgment, detect whether the displacement of the sliding door reaches the preset displacement amount, and if so, Then enter the motor starting step, if not, repeat the speed detection step; the motor starts, the motor is turned on to drive the sliding door to open or close the door.

Further, the speed detection specifically includes the following steps: displacement detection, detecting real-time displacement of the sliding door within a unit time length; speed calculation, calculating a real-time moving speed according to the detected real-time displacement and the unit time length.

Preferably, in the speed calculation step, the real-time movement speed is calculated according to the following formula:

V _gate = S _gate / T; wherein, V _gate is the real-time moving speed of the sliding door, T is the unit time length, and S _gate is the real-time displacement of the sliding door in the unit time length.

Further, in the speed determining step, the set speed is smaller than the sliding door speed at the motor rated power when the sliding door is driven only by the motor.

Preferably, in the motor starting step, the rotational speed of the motor is calculated according to the following formula:

V _motor = a (V _{front door} - V _door ); wherein, the V _{front door} is the sliding door speed under the rated power of the motor when the sliding door is driven by the motor only, the V _door is the real-time moving speed of the sliding door, and a is the transmission relationship. The ratio between the time shifting door speed and the motor speed.

Further, before the speed detecting step, the method further includes: determining the displacement, monitoring the opening height of the sliding door, and entering the speed detecting step when the opening height of the sliding door changes.

The invention also provides a control system for the speed-measuring power-assisted switch sliding door, wherein the sliding door is connected to the driving motor, comprising: a speed detecting module, configured to detect a real-time moving speed of the sliding door in the direction of opening or closing the door; and a speed judging module for Determine whether the real-time moving speed is greater than or equal to the set speed. If yes, the motor starting module is used to start the motor. If not, the displacement judging module is used for judging; the displacement judging module is configured to detect whether the displacement of the sliding door reaches the preset. The displacement amount, if yes, the motor start module is used to turn on the motor. If not, the speed detection module is used to repeat the speed detection; the motor start module is used to open the motor to drive the sliding door to open or close the door.

Preferably, the speed detecting module specifically comprises: a displacement detecting unit that detects a real-time displacement of the sliding door within a unit time length; and a speed calculating unit that calculates the real-time moving speed according to the detected real-time displacement and the unit time length.

Further, in the speed calculation unit, the real-time moving speed is calculated according to the following formula:

Preferably, in the speed determination module, the set speed is smaller than the sliding door speed at the motor rated power when the sliding door is driven only by the motor.

Further, in the motor starting module, the rotational speed of the motor is calculated according to the following formula:

V _motor = a (V _{front door} - V _door ); wherein, the V _{front door} is the sliding door speed driven by the motor rated power, the V _door is the real-time moving speed of the sliding door, and a is the transmission relationship determining the moving door speed and the motor The ratio between the speeds.

Preferably, the controller further includes: a displacement determining module configured to monitor the opening height of the sliding door, and when the opening height of the sliding door changes, the speed detecting module is used for speed detection.

The present invention also provides a fume hood comprising a sliding door and a drive motor coupled to the sliding door, and a control system for the tachometer assisted sliding door as described above.

Further, a displacement sensor is further disposed on the sliding door for detecting the displacement signal of the sliding door and transmitting the displacement signal to the control system.

As described above, the control method, the control system, and the fume hood of the speed-measuring power-assisted switch sliding door provided by the present invention pass the detection The real-time moving speed of the sliding door provides assistance for the opening and closing of the sliding door. The user only needs to provide the initial thrust, and the sliding door can automatically open and close automatically under the assistance of the motor, thereby achieving better users. Experience the effect.

In order to make the above description of the present invention more comprehensible, the preferred embodiments will be described below in detail with reference to the accompanying drawings.

DRAWINGS

Specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

1 is a flow chart of a control method for a sliding door of a speed measuring power assist switch according to a first embodiment of the present invention;

2 is a specific flowchart of a method for controlling a sliding door of a speed measuring power assist switch according to a first embodiment of the present invention;

3 is a schematic diagram showing the connection of a control system module of a speed-measuring power-assisted switch sliding door according to a second embodiment of the present invention;

4 is a schematic diagram showing the connection of a speed detecting module of a sliding speed assist switch sliding door according to a second embodiment of the present invention;

Fig. 5 is a schematic view showing the overall structure of a fume hood according to a third embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can readily understand other advantages and functions of the present invention from the disclosure of the present disclosure. Although the description of the present invention will be described in conjunction with the preferred embodiments, this is not a limitation of the invention. Rather, the invention is described in connection with the embodiments so as to cover other alternatives or modifications that are possible in the embodiments of the invention. In order to provide a thorough understanding of the present invention, many specific details are included in the following description. The invention may also be practiced without these details. In addition, some specific details are omitted in the description in order to avoid obscuring or obscuring the present invention.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

In addition, the terms "upper", "lower", "left", "right", "top", and "bottom" used in the following description are not to be construed as limiting the invention.

[First Embodiment]

As shown in FIG. 1 , a first embodiment of the present invention discloses a control method for a sliding speed assist switch sliding door. The sliding door is connected to the driving motor, and the motor is driven to move the sliding door up and down. The control method includes the following steps:

Step S10: speed detection, detecting a real-time moving speed of the sliding door in the direction of opening or closing the door;

Step S20: determining the speed, determining whether the real-time moving speed is greater than or equal to the set speed, and if so, entering the motor starting step, and if not, entering the displacement determining step;

Step S30: Displacement judgment, detecting whether the displacement of the sliding door reaches a preset displacement amount, and if yes, entering a motor starting step, if not, repeating the speed detecting step;

Step S40: The motor is started, and the motor is turned on to drive the sliding door to open or close the door.

Further, before the speed detecting step, S10 further includes step S00: displacement determination, monitoring the opening height of the sliding door, and entering a speed detecting step when the opening height of the sliding door changes. That is, it is judged whether the sliding door has been displaced. If the sliding door remains still, the motor remains closed and no action is taken to avoid the safety hazard caused by the motor being accidentally opened.

As shown in FIG. 2, the speed detection of step S10 specifically includes the following steps:

Step S11: Displacement detection, detecting real-time displacement of the sliding door within a unit time length;

Step S12: The speed calculation calculates the real-time moving speed according to the detected real-time displacement and the unit time length.

Specifically, in step S11, the position of the sliding door may be monitored in real time using a displacement sensor or other position detecting device having the same function, the displacement sensor or position detecting device being connected to the sliding door and transmitting the position signal to the control center in real time. In practice, the user gives the sliding door an upward (or downward) thrust so that the sliding door starts moving upward (or downward) at a certain speed from the stationary state, and the position of the sliding door changes, at this time by the displacement sensor or other The position signal of the sliding door measured by the position detecting device changes accordingly, thereby obtaining the displacement value of the sliding door for a certain period of time. The real-time moving speed of the sliding door is calculated by detecting the real-time displacement of the sliding door, so that the control method of the embodiment can be applied to the traditional detection of the sliding door displacement for assisting, and the embodiment can be realized without adding new hardware cost. The control method has better practical value.

In the first embodiment of the present invention, the real-time moving speed of the sliding door is calculated according to the following formula: V _gate = S _gate / T; wherein, the V _gate is the real-time moving speed of the sliding door, T is the unit time length, and the S _gate is The real-time displacement of the sliding door over the length of the unit.

In the speed determination of step S20, the set speed may be smaller than the swing speed at the motor rated power when the sliding door is driven only by the motor. Preferably, the set speed can be set to one tenth of the sliding door speed at the motor rated power when the sliding door is driven only by the motor.

In step S30, the preset displacement amount can be set by the user according to the actual situation. When the displacement of the sliding door does not reach the preset displacement amount, the speed detecting step of step S10 is re-executed, and the real-time moving speed of the sliding door is repeated. If the displacement is greater than or equal to the set speed, or until the displacement of the sliding door reaches the set displacement, turn on the motor to assist in opening or closing the door.

During the starting process of the motor in step S40, the rotational speed of the motor is calculated according to the following formula: V _motor = a (V _{front door} - V _door ); wherein, the V _{front door} is a sliding door under motor rated power when the sliding door is driven only by the motor. Speed, V _gate is the real-time moving speed of the sliding door, and a is the ratio between the moving door speed and the motor speed. When the mechanical transmission component between the sliding door and the motor is fixed, there is a fixed proportional value a between the sliding door speed and the motor rotation speed, thereby obtaining the required sliding door speed when the motor is assisted, thereby obtaining The required motor speed. Here, the motor is controlled to run at a certain speed according to actual needs, so that the control process is more precise and energy-saving effect can be achieved.

The control method of the speed-measuring power-assisted sliding door of the first embodiment of the present invention is described in detail below:

When the sliding door is closed, the user gives the sliding door an initial thrust that is turned upward, and uses a displacement sensor to detect the displacement signal of the sliding door in real time. When the displacement of the sliding door changes, the real-time displacement S1 of the sliding door in the first unit time T1 is detected, and the real-time moving speed V1 of the sliding door in the first unit time is calculated according to the formula V _gate =S _gate /T. Thus, V1 = S1/T1.

Set the set speed to V0, compare the real-time moving speed V1 of the sliding door in the first unit time with the set speed V0. When V1≥V0, start the motor to drive the sliding door to open upwards; when V1<V0 At the time, the displacement S1 of the sliding door in the first unit time is judged:

S1 is compared with the preset displacement S0. If S1≥S0, the motor is also started to drive the sliding door to open upward; if S1<S0, the real-time displacement S2 of the sliding door in the second unit time T2 is continuously detected. And according to the formula V _gate = S _gate / T to calculate the real-time moving speed V2 of the sliding door in the second unit time, until the real-time moving speed Vn ≥ V0 of the sliding door in the nth unit time, or until the sliding door When the total displacement S1+S2+...Sn≥S0, the motor is started to drive the sliding door to open upward, thereby the user does not need to continue to apply an upward thrust to the sliding door, thereby achieving a labor-saving effect.

The control method of the first embodiment of the present invention performs the assist control on the sliding door switch. When the user gives the sliding door a large initial thrust, the embodiment can detect the speed of the sliding door so that the sliding door can enter the assisting program more quickly. Therefore, the user's sliding door is pushed more effortlessly and smoothly.

[Second embodiment]

As shown in FIG. 3, a second embodiment of the present invention discloses a control system 1 for a speed-measuring power-assisted switch sliding door. The sliding door is connected to a driving motor, and the control system 1 includes:

The speed detecting module 101 is configured to detect a real-time moving speed of the sliding door in the direction of opening or closing the door;

The speed determining module 102 is configured to determine whether the real-time moving speed is greater than or equal to the set speed. If yes, the motor starting module is used to start the motor, and if not, the displacement determining module is used to determine;

The displacement determining module 103 is configured to detect whether the displacement of the sliding door reaches a preset displacement amount, and if yes, the motor starting module is used to turn on the motor, and if not, the speed detecting module is repeatedly used for speed detection;

The motor starting module 104 is configured to open the motor to drive the sliding door to open or close the door.

Further, the control system of the embodiment further includes a displacement determining module 100 for monitoring the opening height of the sliding door. When the opening height of the sliding door changes, the speed detecting step is entered. That is, it is judged whether the sliding door has been displaced. If the sliding door remains still, the motor remains closed and no action is taken to avoid the safety hazard caused by the motor being accidentally opened.

As shown in FIG. 4, the speed detecting module 101 specifically includes the following:

The displacement detecting unit 201 detects a real-time displacement of the sliding door within a unit time length;

The speed calculation unit 202 calculates the real-time moving speed based on the detected real-time displacement and the unit time length.

Specifically, in the displacement detecting unit 201, the position of the sliding door can be monitored in real time by using a displacement sensor or other position detecting device having the same function, the displacement sensor or the position detecting device is connected to the sliding door, and the position signal is sent to the control center in real time. . In practice, the user gives the sliding door an upward (or downward) thrust so that the sliding door starts moving upward (or downward) at a certain speed from the stationary state, and the position of the sliding door changes, at this time by the displacement sensor or other The position signal of the sliding door measured by the position detecting device changes accordingly, thereby obtaining the displacement value of the sliding door for a certain period of time.

In the second embodiment of the present invention, the real-time moving speed of the sliding door in the speed calculating unit 202 is calculated according to the following formula: V _gate = S _gate / T; wherein, the V _gate is the real-time moving speed of the sliding door, and T is the unit time Length, S _gate is the real-time displacement of the sliding door within the length of the unit.

In the speed determination module 102, the set speed may be less than the sliding speed at the motor rated power when the door is only driven by the motor. Preferably, the set speed can be set to one tenth of the sliding door speed at the motor rated power when the sliding door is driven only by the motor.

In the displacement judging module 103, the preset displacement amount can be set by the user according to the actual situation. When the displacement of the sliding door does not reach the preset displacement amount, the speed detection is performed again, and the reciprocating motion is repeated until the real-time moving speed of the sliding door is greater than or equal to Set the speed, or until the displacement of the sliding door reaches the set displacement, turn on the motor to assist in opening or closing the door.

In the motor starting module S104, the rotational speed of the motor is calculated according to the following formula: V _motor = a (V _{front door} - V _door ); wherein, the V _{front door} is the sliding door speed under the rated power of the motor when the sliding door is driven only by the motor, The V _gate is the real-time moving speed of the sliding door, and a is the ratio between the moving door speed and the motor speed determined by the transmission relationship. When the mechanical transmission component between the sliding door and the motor is fixed, there is a fixed proportional value a between the sliding door speed and the motor rotation speed, thereby obtaining the required sliding door speed when the motor is assisted, thereby obtaining The required motor speed. Here, the motor is controlled to run at a certain speed according to actual needs, so that the control process is more precise and energy-saving effect can be achieved.

The control system of the speed-measuring power-assisted sliding door of the second embodiment of the present invention is described in detail below:

When the sliding door is opened, the user gives the sliding door a downward thrust initial thrust, and uses a displacement sensor to detect the displacement signal of the sliding door in real time. When the displacement of the sliding door changes, the real-time displacement S1 of the sliding door in the first unit time T1 is detected, and the real-time moving speed V1 of the sliding door in the first unit time is calculated according to the formula V _gate =S _gate /T. Thus, V1 = S1/T1.

Set the set speed to V0, compare the real-time moving speed V1 of the sliding door in the first unit time with the set speed V0. When V1≥V0, start the motor to drive the sliding door to close downward; when V1< At V0, the displacement S1 of the sliding door in the first unit time is judged:

S1 is compared with the preset displacement S0. If S1≥S0, the motor is also started to drive the sliding door to close downward; if S1<S0, the real-time displacement of the sliding door in the second unit time T2 is continuously detected. S2, and according to the formula V _gate = S _gate / T to calculate the real-time moving speed V2 of the sliding door in the second unit time, until the real-time moving speed Vn ≥ V0 of the sliding door in the nth unit time, or until the sliding door The total displacement S1+S2+...Sn≥S0 starts the motor to drive the sliding door to close downward, thereby eliminating the need for the user to continue to apply upward thrust to the sliding door, thereby achieving a labor-saving effect.

The control system of the second embodiment of the present invention performs the assist control on the sliding door switch. When the user gives the sliding door a large initial thrust, the embodiment can detect the speed of the sliding door so that the sliding door can enter the assisting program more quickly. Therefore, the user's sliding door is pushed more effortlessly and smoothly.

[Third embodiment]

As shown in FIG. 5, a third embodiment of the present invention provides a fume hood, including a sliding door 2 and a driving motor 3 connected to the sliding door, and a control system 1 for the speed-measuring power-assisting sliding door. The control system 1 includes:

The speed detection module specifically includes the following:

Further, the sliding door 2 is further provided with a displacement sensor 4 for detecting the displacement signal of the sliding door and transmitting the displacement signal to the control system. The displacement sensor monitors the position of the sliding door in real time and sends a position signal to the control center in real time. In practice, the user gives the sliding door an upward (or downward) thrust so that the sliding door starts moving upward (or downward) at a certain speed from the stationary state, and the position of the sliding door changes, which is measured by the displacement sensor. The sliding door position signal changes accordingly, thereby obtaining the displacement value of the sliding door for a certain period of time. The real-time moving speed of the sliding door is calculated by detecting the real-time displacement of the sliding door, so that the control method of the embodiment can be applied to the traditional detection of the sliding door displacement for assisting, and the embodiment can be realized without adding new hardware cost. The control method has better practical value.

The real-time moving speed of the sliding door in the speed calculating unit 202 is calculated according to the following formula: V _gate = S _gate / T; wherein, the V _gate is the real-time moving speed of the sliding door, T is the unit time length, and the S _door is the sliding door. Real-time displacement over the length of time.

The ventilating cabinet of the embodiment further includes a human-machine interface 5 for the operator to set the set speed, the preset displacement amount, and the like, and display real-time control information, so that the operator can input and receive the control command.

In summary, the control method, the control system and the fume hood of the speed-measuring power-assisted switch sliding door provided by the present invention provide assistance for opening and closing of the sliding door by detecting the real-time moving speed of the sliding door, and the user only needs to provide the initial thrust. The sliding door can automatically open and close automatically under the assistance of the motor. When the user gives the sliding door a large initial thrust, the sliding door can enter the assisting program more quickly, thus achieving better users. Experience the effect. The above-described embodiments are merely illustrative of the principles of the invention and its effects, and are not intended to limit the invention. Anyone familiar with this technology Modifications or variations of the above-described embodiments may be made without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and scope of the invention will be covered by the appended claims.

Claims

A control method for a speed-measuring power-assisted switch sliding door, the sliding door being connected to a driving motor, comprising the following steps:

Speed detection, detecting a real-time moving speed of the sliding door in the direction of opening or closing the door;

Speed determination, determining whether the real-time moving speed is greater than or equal to the set speed, and if so, entering a motor starting step, and if not, entering a displacement determining step;

Displacement determination, detecting whether the displacement of the sliding door reaches a preset displacement amount, and if yes, entering a motor starting step, if not, repeating the speed detecting step;

The motor is started, and the motor is turned on to drive the sliding door to open or close the door.
The control method according to claim 1, wherein the speed detecting step comprises the following steps:

Displacement detection, detecting real-time displacement of the sliding door within a unit time length;

The speed calculation calculates the real-time moving speed based on the detected real-time displacement and the unit time length.
The control method according to claim 2, wherein in said speed calculating step, said real-time moving speed is calculated according to the following formula:

V gate = S gate / T;

Wherein, the V gate is the real-time moving speed of the sliding door, T is the unit time length, and the S gate is the real-time displacement of the sliding door within the unit time length.
The control method according to claim 1, wherein in the speed determining step, the set speed is smaller than a sliding door speed at a motor rated power when the sliding door is driven only by the motor.
The control method according to claim 1, wherein in said motor starting step, said motor speed is calculated according to the following formula:

V motor = a (V fore gate - V door );

Wherein, the V fore gate is the sliding door speed under the motor rated power when the sliding door is driven only by the motor, the V gate is the real-time moving speed of the sliding door, and a is the transmission relationship determining the sliding door speed and the motor speed. The ratio between the two.
The control method according to claim 1, further comprising: before the speed detecting step:

The displacement determination monitors the opening height of the sliding door, and when the opening height of the sliding door changes, the speed detecting step is entered.
A control system for a speed-measuring power-assisted switch sliding door, the sliding door being connected to a driving motor, comprising:

a speed detecting module, configured to detect a real-time moving speed of the sliding door in a door opening or closing direction;

The speed determining module is configured to determine whether the real-time moving speed is greater than or equal to the set speed, and if yes, the motor starting module is used to start the motor, and if not, the displacement determining module is used to determine;

a displacement determining module, configured to detect whether the displacement of the sliding door reaches a preset displacement amount, and if yes, use a motor starting module to turn on the motor; if not, the speed detecting module repeatedly performs speed detection;

The motor starting module is configured to open the motor to drive the sliding door to open or close the door.
The control system of claim 7, wherein the speed detecting module comprises:

a displacement detecting unit that detects a real-time displacement of the sliding door within a unit time length;

The speed calculation unit calculates the real-time moving speed based on the detected real-time displacement and the unit time length.
The control system according to claim 8, wherein in said speed calculating unit, said real-time moving speed is calculated according to the following formula:

V gate = S gate / T;

Wherein, the V gate is the real-time moving speed of the sliding door, T is a unit time length, and the S gate is a real-time displacement of the sliding door within a unit time length.
The control method according to claim 7, wherein in the speed judging module, the set speed is smaller than a sliding door speed at a motor rated power when the sliding door is driven only by the motor.
The control system according to claim 7, wherein in said motor starting module, said motor speed is calculated according to the following formula:

V motor = a (V fore gate - V door );

Wherein, the V fore gate is the sliding door speed driven by the rated power of the motor, the V gate is the real-time moving speed of the sliding door, and a is the ratio between the moving door speed and the motor speed determined by the transmission relationship.
The control system of claim 7 wherein said controller further comprises:

The displacement judging module is configured to monitor the opening height of the sliding door. When the opening height of the sliding door changes, the speed detecting module is used for speed detection.
A fume hood comprising a sliding door and a drive motor coupled to the sliding door, further comprising a control system for the tachometer of the tachometer of any of claims 7-12.
A fume hood according to claim 13, wherein said sliding door is further provided with a displacement sensor for detecting a displacement signal of said sliding door and transmitting said displacement signal to said control system.